Clamping appliance.



device of this description in which the PETER DOSCK AND CHARLES R.

DOSCH, OF STRATFORD, CONNECTICUT; SAID CHARLES R. BOSCH ASSIGNOR TO SAID PETER DOSCH.

CLAMPING APPLIANCE.

Specification of Letters Patent.

Patented Apr. 8,1913.

Application fllcti January 27, 1812. Berial No. 673,889.

To all ttltmlb it may concern:

lle it known that we, PI-iTl-Zll Doscii and (naaass ll. Doscii, citizens of the l lnited States, residing at Stratford, Fairtield eounty, Conneetieut, have invented certain new and useful improvements in Clamping Appliances: and we do declare the fol owing to he a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 0

our invention relates to certain improvements in clamping appliances and has for its object to provide a simple and effective screw operating elements shall be engaged with separable nut elements whereby the clamping jaws may be quickly ad usted, and with these ends in view our invention consists in eertain details of construction and combinathat of parts sltCli as will be hereinafter fully described and then more particularly pointed out in the claims which conclude this description.

In the accompanying drawing Figure 1 is a sectional elevation of our improved elamping appliance-Fig.2 a section at the line :0, w, o ig. 1 and Fag. 3 a detail sectional elevation o a mo ification of our improved sectional nut.

Similar numerals of reference denote like parts in the several figures of the drawing.

1,2, are the clamping jaws of any approved dimensions and shape. These aws are pre ernbly inndo of metal the jaw 1 having three perforate bosses 8, 4, 5, extending upwardly from the bottom face thereof.

6, 7, are elongated bars that rest upon the bosses 8, 4, and 6, and these bars are capable of lengthwise movements and are also oweled together by pins 8 (shown in dotted lines), in order that said bars may be properly guided in their lengthwise movements. 'lhese bars 6 7, are cut away at their central mrtions to orm recesses l), 10, and extendmg within these recesses is a cam 11 that is carried by a pin 12, which latter has a cireular head 13 at its lower end that is contained within a countersunk circular recess in the bottom of the jaw 1, while to the upper extremity of this in is secured a thumb iiece 14 that has a tub 16 which extends d ownwardly and rests upon the bars i and 7, so that it will be clearly understood that said bars are confined between the boss 4 and said hub 15. By swinging this thumb piece 14 in one direction the cam 11 will be operated to strike a ainst the end walls of the recesses 9, 10, to thrust the bars (i, 7, in opposite directions, while the reverse operation of this thumb piece will effect the reverse movements of said bars.

10, 16", are the o crating screws irovided with suitable hantles 17, 18, which screws ate normally en aged by nut segments 10, 20, and 21, 22, tie segments 10 and 22 be ing carried by the bar 0 while the segments 20, 21 are carried by the bar 7, these screws passing freely throu h the perforate bosses 3, l), and also freely t irougli elongated openings 23, 24, in the jaw 2 and through a free keeper plate 25, immediately below said openings, nuts 20, 27 being rim on the ends of said screws against said plate and secured as against rotation by means of pins 28, 29, driven through the screws and engaging iiidcntatious in the nuts themselves, said pins acting as looking devices to reventdisplacement of the nuts. From tie above description it will be understood that these screws are really swiveled to the jaw 2, and engage with separable nut segments carried by the jaw 1.

In utilizing clamping appliances there is a loss of time and great inconvenience due to the fact that the screws must be operated to adjust the clamping 'aws to work the dimensions of which diil'er widely, butby the operation of the thumb piece H the bars ti, 7, which carry the complementary nut seglneiits may be operated so as to spread these segments away from the screws thereby en abling the jaws to be manually adjusted to the work and thereafter the thumb piece is operated to bring the nut segments again into engagement with the screws whereupon the latter are operated to ellect the linal clamping operations.

, It frequently happens that, in some iiistanees, one clamping jaw should be in advance of the other, and this is possible in our improvement, owing to the fact that the screws extend through the elongated slots 23, 24, in the jaw 2, thereby enabling said jaw to be adjusted Futhat. it, will extend either forward or rearward of the jaw l, the keeper plate 25 insuring the parallelism of the screws in ellcctiug these adjust meats.

There are several ways in whieh the eleltltl ments that carry the complementary nut segments may be constructed and operated, and at Fig. 8 we have shown a construction comprising bars 30, 31, that are ivoted respectively at 32, 88, to the jaw each bar carryin comglementary nut segments 84 3b, and are 8 87, pivoted at 88, 80, to sai jaw 1, and carrving complementary nut segments 40, 41, the inner extremities of these bars being pivoted to ther at 42, 43, the cam 11 carried by t 0 pin 12 operating against said bars at their pivotal points 42, 4 to engage the nut segments with the screws 10, 10, while s irings 44 45, whose extremities are securet to said bars 80, 37 and 30, 31, respectively, operate to spread said bars and seiarate the nut segments from the screws. Ve therefore do not wish to be limited to any particular construction of separable nut segments since our invention in this respect resides in the broad idea of providin segments of this descri tion which may operated at the willjo the operator.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is 1. A clamp comprising a pair of jaws, threaded adjusting rods 'connecting the aws a pair of op ositely disposed bars carrie by one of t e jaws and having complemental nut segments for en aging the rods, each bar being formed 0 pivotally connected sections and each section being pivotally connected to the jaw, yieldable means connecting the bars, and means for separating the bars to release the adjusting rods.

2. A clamp comprising a pair of jaws, threaded adjusting rods extending through one jaw, means for swiveling the rods to the other jaw, a pair of oppositely disposed sectional bars carried by the first mentioned jaw, each bar being formed of pivotally connected sections and each section being piroted to the jaw, the free ends of the SOCtlOlh being provided with complemental nut segments for engaging the rods, springs ('(n|- neeting the bars, and means for separating the bars to release the adjusting rods.

3. A clamping appliance comprising a i pair of jaws, adjusting rods connecting the jaws, nuts carried by one jaw for engaging the rods, means for disengaging the nuts from the rods, the other jaw being )i'ovided with lon itudinal slots through w lltll the rods extent a guide plate mounted on the rods beneath the slots and slidable lougitudinallv in the jaw, and clamping means on the rods for engagin the plate to hold the same in slidable relation to the slots.

In testimony whereof we aflix our signatnres in presence of two witnesses.

PETER DOSCI-I. CHAS. R. DOSCIl.

Witnesses:

F. W. Sarrrn, J r., S. -B. Bnswsrsa.

0! of mu patent I! be obtained for in cents each, by addressing the Commissioner at I'atents, Washington, D. O." 

